android 自定义Dialog下载文件

package com.spring.sky.dialog.download; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.URL; import java.net.URLConnection; import com.zhangke.R; import android.app.Dialog; import android.content.Context; import android.graphics.BitmapFactory; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.ProgressBar; import android.widget.TextView; import android.widget.Toast; /*** * dialog文件下载 * @author spring sky <br> * QQ ：840950105 */ public class DownloadDialog extends Dialog implements android.view.View.OnClickListener { private static final int DOWNLOAD_PREPARE = 0; private static final int DOWNLOAD_WORK = 1; private static final int DOWNLOAD_OK = 2; private static final int DOWNLOAD_ERROR = 3; private static final String TAG = "IndexActivity"; private Context mContext; private Button bt; private ProgressBar pb; /** 下载过程中不能点击 */ private boolean isClick = false; private boolean downloadOk = false; private TextView tv; /** * 下载的url */ private String url = null; private String filePath; /** * 文件大小 */ int fileSize = 0; /** * 下载的大小 */ int downloadSize = 0; /** * handler */ private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case DOWNLOAD_PREPARE: Toast.makeText(mContext, "准备下载", Toast.LENGTH_SHORT).show(); pb.setVisibility(ProgressBar.VISIBLE); Log.e(TAG, "文件大小:" + fileSize); pb.setMax(fileSize); break; case DOWNLOAD_WORK: Log.e(TAG, "已经下载:" + downloadSize); pb.setProgress(downloadSize); int res = downloadSize * 100 / fileSize; tv.setText("已下载：" + res + "%"); bt.setText(FileUtil.FormetFileSize(downloadSize) + "/" + FileUtil.FormetFileSize(fileSize)); break; case DOWNLOAD_OK: downloadOk = true; bt.setText("下载完成显示图片"); downloadSize = 0; fileSize = 0; Toast.makeText(mContext, "下载成功", Toast.LENGTH_SHORT).show(); break; case DOWNLOAD_ERROR: downloadSize = 0; fileSize = 0; Toast.makeText(mContext, "下载失败", Toast.LENGTH_SHORT).show(); break; } super.handleMessage(msg); } }; private ImageView imageView; public DownloadDialog(Context context, String url) { super(context, R.style.Theme_CustomDialog); mContext = context; this.url = url; filePath = FileUtil.getPath(mContext, url); } @Override public void cancel() { super.cancel(); } /** * 下载文件 */ private void downloadFile() { try { URL u = new URL(url); URLConnection conn = u.openConnection(); InputStream is = conn.getInputStream(); fileSize = conn.getContentLength(); if (fileSize < 1 || is == null) { sendMessage(DOWNLOAD_ERROR); } else { sendMessage(DOWNLOAD_PREPARE); FileOutputStream fos = new FileOutputStream(filePath); byte[] bytes = new byte[1024]; int len = -1; while ((len = is.read(bytes)) != -1) { fos.write(bytes, 0, len); fos.flush(); downloadSize += len; sendMessage(DOWNLOAD_WORK); } sendMessage(DOWNLOAD_OK); is.close(); fos.close(); } } catch (Exception e) { sendMessage(DOWNLOAD_ERROR); e.printStackTrace(); } } /*** * 得到文件的路径 * * @return */ public String getFilePath() { return filePath; } private void init() { bt = (Button) this.findViewById(R.id.down_bt); bt.setOnClickListener(this); tv = (TextView) this.findViewById(R.id.down_tv); pb = (ProgressBar) this.findViewById(R.id.down_pb); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.down_bt: if (isClick) { // 启动一个线程下载文件 Thread thread = new Thread(new Runnable() { @Override public void run() { downloadFile(); } }); thread.start(); isClick = false; } if (downloadOk) // 下载完成后 ，把图片显示在ImageView上面 { imageView.setImageBitmap(BitmapFactory.decodeFile(filePath)); cancel(); } break; default: break; } } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.download_layuot); init(); } /** * @param what */ private void sendMessage(int what) { Message m = new Message(); m.what = what; handler.sendMessage(m); } public void setImageView(ImageView imageView) { this.imageView = imageView; } @Override public void show() { isClick = true; downloadOk = false; super.show(); } }